The Telefunken 6463 is an extremely rare tube and sound incredible. These are genuine with box / wing plates, halo getters and <> bottoms. Guaranteed true NOS NIB. These came in a bulk-pack from Telefunken so we gave them white boxes - they do not come with the original boxes. Date codes: 252550 U7202901.

Testing and/or matching: We have multiples of these in stock and therefore are not listing the test results here. All of these have been tested and or matched by/for Gm on a calibrated Hickok TV-7 tube tester. Test results are on box.

** Please note, many tubes will test NOS but will actually have a few hours of use on them. A truly NOS tube will have excellent getter flashing condition, no dirt/grime, usually in the original box, and no filament deposits. If a tube is listed as "tests NOS" but is listed as "not True NOS" please expect the tube to have a small amount of use *

All tubes have been tested using only the best tube testers. We have a large fleet of tube testers, and every single one of them has been calibrated within the last year by industry experts. We mainly use the Hickok TV-7D/U, but occasionally we may use a Hickok 539, 533A, or 600A.

Description

The Telefunken 6463 is an extremely rare tube and sound incredible. These are genuine with box / wing plates, halo getters and <> bottoms. Guaranteed true NOS NIB. These came in a bulk-pack from Telefunken so we gave them white boxes - they do not come with the original boxes. Date codes: 252550 U7202901.

Testing and/or matching: We have multiples of these in stock and therefore are not listing the test results here. All of these have been tested and or matched by/for Gm on a calibrated Hickok TV-7 tube tester. Test results are on box.

** Please note, many tubes will test NOS but will actually have a few hours of use on them. A truly NOS tube will have excellent getter flashing condition, no dirt/grime, usually in the original box, and no filament deposits. If a tube is listed as "tests NOS" but is listed as "not True NOS" please expect the tube to have a small amount of use *

All tubes have been tested using only the best tube testers. We have a large fleet of tube testers, and every single one of them has been calibrated within the last year by industry experts. We mainly use the Hickok TV-7D/U, but occasionally we may use a Hickok 539, 533A, or 600A.